Re: U1 fried
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After re-reading your post I now see your point. But I think it a lot less likely that someone would plug a mono plug into a mono to stereo adapter IMHO.
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
I assume the mono to serial adapter would just short the mono signal to both stereo signals.
It appears at least a few folks have fried U1 by inserting a mono plug in the speaker jack and shorting out the audio. I’d recommend only wiring up the tip connection and not the ring and then using an external mono to serial adapter for your stereo phones.